Oxidation of glucose and arabinose mixtures over Au/Al 2 O 3
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Oxidation of glucose and arabinose mixtures over Au/Al2O3 Sebastian Franz1 · Nataliya D. Shcherban2 · Irina L. Simakova3 · Markus Peurla4 · Kari Eränen1 · Johan Wärnå1 · Tapio Salmi1 · Dmitry Yu. Murzin1 Received: 29 September 2020 / Accepted: 24 October 2020 © The Author(s) 2020
Abstract Oxidation of a mixture of glucose and arabinose over 1% Au deposited on alumina was investigated in a semi-batch reactor varying pH, temperature and partial pressure of oxygen. Elevation of the latter enhancing the rate induced also losses in selectivity to aldonic acids. A kinetic model representing the catalytic oxidation reactions of arabinose and glucose along with respective isomerization to fructose and ribulose was developed. Calculations based on the model were able to describe experimental data in a reliable way. Keywords Sugar oxidation · Gold catalysts · Glucose · Arabinose · Kinetic modelling
Introduction Supported gold nanoparticles being highly active and selective low-temperature catalysts in the oxidation of carbon monoxide, carbohydrates and aldehydes [1–7] have also demonstrated a superior durability due to high resistance to deactivation, which is typically caused by over-oxidation and poisoning of the active metal phase [8]. It has been shown that alumina supported gold nanoparticles exhibit a high catalytic activity in the oxidation of sugar molecules under mild reaction conditions [9, 10]. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1114 4-020-01901-w) contains supplementary material, which is available to authorized users. * Dmitry Yu. Murzin [email protected] 1
Laboratory of Industrial Chemistry and Reaction Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, Abo, 20500 Turku, Finland
2
L.V. Pisarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 pr. Nauky, Kiev 03028, Ukraine
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Boreskov Institute of Catalysis, Lavrentieva ave. 5, Novosibirsk, Russia 630090
4
University of Turku, 20500 Turku, Finland
13
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Reaction Kinetics, Mechanisms and Catalysis
Structure sensitivity for the oxidation reactions has been observed implying that the size of the gold nanoparticles influences the catalytic activity [5, 11]. For example in the oxidation of arabinose the maximum of catalytic activity was reported to be at the gold cluster size of ca. 2.5 nm [10]. Utilization of natural resources such as lignocellulosic biomass for the catalytic transformation of monomeric and oligomeric sugars into value-added products attracts an increasing attention complying with sustainable development [12, 13]. For instance, the hemicellulose arabinogalactan, which appears in large amounts in Larix sibirica, can be selectively converted to arabinose and galactose monomers via acid-catalyzed hydrolysis. Both homogeneous and heterogeneous catalysts can be used as discussed in [14]. The sugar monomers can be transformed catalytically to valuable products by hydrogenation, isomeriza
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